摘要： 以日光温室黄瓜为供试材料,系统研究了氮肥用量(225,450,675和900 kg/hm²)对黄瓜生长发育及其果实和不同土层土壤硝态氮含量的动态变化。结果表明:增加氮肥的用量能促进黄瓜的生长发育、提高黄瓜产量 但当氮肥用量超过675 kg/hm²时增产效果不明显,甚至导致减产 氮肥用量与土壤和黄瓜果实中硝态氮的含量呈极显著正相关,在黄瓜的整个生育期内,土壤中硝态氮的含量呈现先降低后升高的变化趋势,而黄瓜果实中硝态氮含量先升高在后期逐渐降低。

关键词: 氮肥用量, 黄瓜, 土壤, 硝态氮

Abstract: The effect of different levels N application (225,450,675 and 900 kg/ ha) on cucumber growth and N0₃-N changes in fruit and soil was studied in sunlight greenhouse with cucumber. The result showed that high nitrogen fertil-izer improved the growth and yield of cucumber,but the yield decreased at 675 kg/ ha;Correlation between N levels andN03-N in soil and cucumber was significant positive,N03 - -N in soil became lower with the cucumber growing develop-ing and then increased after fruiting stage in the whole growth stage,while N0₃-N in fruit increased and then becamelower.

Key words: Nitrogen levels, Cucumber, Soil, Nitrate

中图分类号: 

• S642.2